US20140000970A1 - Drive device for driving a wheel for an electrically powered vehicle - Google Patents
Drive device for driving a wheel for an electrically powered vehicle Download PDFInfo
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- US20140000970A1 US20140000970A1 US14/004,739 US201214004739A US2014000970A1 US 20140000970 A1 US20140000970 A1 US 20140000970A1 US 201214004739 A US201214004739 A US 201214004739A US 2014000970 A1 US2014000970 A1 US 2014000970A1
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- Prior art keywords
- wheel
- drive device
- driving
- electric machine
- transmission
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- 230000005540 biological transmission Effects 0.000 claims abstract description 89
- 239000000725 suspension Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
- B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K7/00—Disposition of motor in, or adjacent to, traction wheel
- B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K7/00—Disposition of motor in, or adjacent to, traction wheel
- B60K2007/0038—Disposition of motor in, or adjacent to, traction wheel the motor moving together with the wheel axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K7/00—Disposition of motor in, or adjacent to, traction wheel
- B60K2007/0061—Disposition of motor in, or adjacent to, traction wheel the motor axle being parallel to the wheel axle
Definitions
- the present invention concerns a drive device to drive a wheel of an electrically powered vehicle.
- the drive train configuration in an electrically driven vehicle is the same configuration as in vehicles which have a central drive, comprising a combustion engine.
- a drive device which comprises of an electric machine, a transmission, and a differential which is fixed to the chassis in a position in the center of the vehicle between the front wheels and the rear wheels; the drive torque is transferred like in conventional central drives via side shafts to the driven wheels.
- the chassis concept is mostly maintained, wherein only modifications in the aggregate bearings and auxiliary frames are required.
- electric drives that are arranged near the wheels are known in the state-of-the-art, wherein near the wheel means a drive in the broader sense which has one or several electric motors for each driven wheel of a vehicle. Therefore, vehicles are known which have two or more driven wheels which have a corresponding number of drives, meaning two or more. Hereby each electric motor can precisely drive one drive wheel.
- the electric drives can be positioned fixed to the wheel carrier; in this case, the electric drive swings directly with the respective wheel and the unsuspended mass is directly influenced by the drive.
- the electric drives which are close to the wheel can be fixed in position.
- the electric drives are moved from the center of the vehicle towards the wheels.
- the drives are, however, still attached to the chassis structure and therefore do not influence the unsuspended masses.
- the electric drives can also be positioned at suspension rods, whereby they are attached in this case at the chassis suspension rods, for instance at the torsion rods.
- the unsuspended mass is reduced by positioning the electric drives close to the chassis-fixed connection points of the suspension rod.
- a driven vehicle axle designed as a torsion rod axle, in which each wheel of the axle has an electric motor assigned to it which is positioned with the rotational axis in the longitudinal direction of the vehicle, whereby its housing represents a part of the longitudinal swing part of the torsion rod.
- the drives which are close to the wheel can be utilized in vehicles with an all-wheel, front, or rear drive, whereby the type of axles of the driven vehicle axles can be conventional axel types, such as for instance strut axles or double wishbone axles.
- the drives close to the wheel can be integrated with the wheel integrated chassis.
- the electric drives which are close to the wheel can have a transmission.
- WO 2008/017945 A1 is a drive device, which can be integrated into a wheel of a vehicle, to drive the wheel where the device comprises of an electric motor and a transmission device, wherein the transmission device comprises a spur gear transmission and a planetary transmission which are connected in series.
- the planetary transmission is positioned, viewed in the flow of force direction in traction operation, at the output side of the spur gear transmission.
- drives torques can be generated at individual wheels through electric drives near the wheel, whereby functions such as torque vectoring, ESP, ABS, ASR, etc. can be realized in a simple way. Through the fast and accurate control of electric drives, these functions can be optimized in comparison to the traditional, brake based control systems.
- the objective of the present invention is to present a drive device for the drive of a wheel for an electrically driven vehicle.
- a drive device for the drive of a wheel of a torsion rod axle for an electrically driven vehicle comprising an electric machine and a transmission unit, whereby the transmission unit has a spur gear transmission and a planetary transmission which is positioned, when viewed in the flow of force direction in a traction-mode, on the output side of the electric machine in the sequence of the planetary gear-spur gear transmission.
- the planetary transmission is positioned coaxial to the rotor of the electric machine, wherein the spur gear transmission is positioned axially parallel to the rotor of the electric machine.
- the drive device is positioned axially parallel to the wheel axis.
- the axial offset is used to reduce the distance between the center of gravity of the drive device and the point of rotation, around which the wheel axis moves, relative to the vehicle construction, which again results in a reduction of the unsuspended mass.
- the drive device is positioned between the center of the wheel and the point of rotation, within the point of rotation, or in the center of the wheel which is facing away from the point of rotation.
- the achieved gear ratio can be a value larger than 10, due to the two transmissions.
- the gear ratio meaning the ratio between the rotational speed the driveshaft of the transmission in comparison to the rotational speed of the output shaft of the transmission, has a value larger than 10, preferably between 13 and 18, in particular the value 16.
- the distribution of the achievable gear ratios to the transmissions can be performed symmetrically or asymmetrically.
- the electric machine can therefore have small dimensions, which advantageously enables or rather simplifies, the integration of the electric machine into the trailing arm.
- the use of a spur gear enables an offset between the driveshaft of the electric machine and the wheel axle, so that the electric machine can be moved on the trailing arm further in the direction of the connection point of the trailing arm, therefore lowering the unsuspended mass.
- the transmissions with a high rotational speed electric motor like a machine with a maximal rotational speed of more than 15,000 rpm, preferably between 18,000 and 22,000 rpm, in particular 21,000 rpm, this enables positioning the planetary transmission immediately following the electric machine with lesser sound than when using a spur gear in the same position, because the planetary transmission is generally designed more compact and the housing surfaces, which transmit sound, in the area of the high-speed transmission section are reduced.
- a housing of the drive device can serve as a wheel carrier, as a wheel mounted suspension rod, or as part of the wheel carrier and pass created forces into the chassis.
- the electric machine and the transmission unit are positioned in such a way that, in a primary position of operation of the vehicle, the lubrication material flows back due to gravity into the oil sump in the transmission space, whereby for this purpose the housing of the electric machine is designed in a way that sufficient lubrication of the bearings of the rotor shaft is guaranteed.
- the electric machine and the planetary transmission can have a common housing.
- connection of the brake caliper in the case of a disc brake and/or the damper and/or the spring, can be integrated in the housing of the drive device, whereby the connecting screws for attaching the brake caliper are at the same time the screws for the housing and for the attachment of the drive device at the trailing arm of the axle.
- the drive device can in particular be combined with a torsion rod, a central control arm axle, a suspension arm axle, or a trailing arm axle.
- a torsion rod axle is for instance meant as an axle with two trailing arms and a crossmember which connects them.
- a central control arm axle is meant to be an axle with two trailing arms, whereby each trailing arm is connected with two crossmembers, which are mounted to the chassis.
- a suspension arm axle has at each wheel an approximately triangular swing arm which is connected with the two ends at the chassis and with the apex at the wheel carrier.
- a trailing arm axle is an axle which has at each wheel a trailing arm which is on one side connected with the chassis and on the other side with the wheel.
- FIG. 1 a schematic top view of a designed torsion rod rear axle as in the state-of-the-art
- FIG. 2 a schematic sectional view of a first embodiment of an inventive drive device for an electrically driven vehicle and the positioning of the drive device;
- FIG. 3 a perspective view of the configuration of an inventive drive device.
- a rear torsion rod axle 1 as in the state-of-the-art, comprises of two trailing arms 2 , 3 which are connected with each other through a cross-section 4 .
- the rear torsion rod axle 1 is screwed together through two rubber bearings 5 , 6 with the chassis of the vehicle.
- the wheels of the rear torsion rod axle 1 are marked in the drawing with the reference characters 7 or 8 , respectively.
- the attached FIG. 1 shows a damper 9 and a spring 10 of the axle 1 .
- FIG. 2 of the invention presents a drive device 11 for driving a wheel 7 of a torsion rod axle 1 of an electrically driven vehicle which has an electric machine 12 and a transmission unit which comprises of a spur gear transmission 14 and a planetary transmission 13 which, when viewed in the direction of the power flow during traction operation, are positioned towards the output, after the electric machine 12 in the sequence of the planetary transmission 13 —the spur gear transmission 14 .
- the planetary transmission 13 and the spur gear transmission 14 are in this example, axially viewed, positioned on the side of the electric machine 12 facing the wheel 7 .
- the rotor 15 of the electric machine 12 which is designed as an inner rotor, is connected via a sun gear shaft with the sun gear 17 of the planetary transmission 13 , whereby the carrier 18 of the planetary transmission 13 is connected, via a carrier shaft 19 , to the pinion 20 (meaning with the small gear) of the spur gear transmission, which meshes with the spur gear 21 (meaning with the large gear).
- the spur gear 21 is connected with the wheel hub 22 of the wheel 7 , preferably by means of a pluggable spline shaft connection or a polygon profile, or designed as one part with the wheel hub 22 , whereby the installation and manufacturing costs are reduced.
- the connection between the carrier shaft 19 and the pinion 20 is preferably axially and radially supported through roller bearings, slide bearings, or thrust washers.
- the stator of the electric machine in FIG. 2 is marked with the reference character 16 .
- the ring gear 23 of the planetary transmission 13 is fixed in positioned to the housing; it can be coupled to the housing 24 of the planetary transmission 13 , designed as one part with the housing 24 , or press-fit into the housing 24 .
- a radial recess can be provided to compensate for the difference in the diameters between the housing 24 and the ring gear 23 . If the ring gear 23 is designed as a ring gear ring which can be press-fit into a cylindrical housing, the material can be selected depending on the load, which might result in a reduction of the weight.
- the planetary transmission 13 and the electric machine 12 can have a common housing within the framework of a further embodiment.
- the housing of the electric machine 12 is marked with the reference character 26 .
- the rotor shaft 15 of the electric machine 12 can be designed as one part with the sun gear shaft; the carrier shaft 19 can also be designed as one part with the pinion 20 .
- the drive and/or the output of the planetary transmission 13 can take place via an additional element of the planetary transmission.
- the gearing is preferably of a helical design, whereby the bearing of the sun gear shaft of the planetary transmission 13 is formed through the bearing on the drive side of the rotor 15 of the electric machine 12 , so that the need for separate bearings can be omitted, whereby the bearing of the rotor 15 of the electric machine 12 , facing away from the sun gear 17 of the planetary transmission 13 , can be preferably axially pre-loaded through a spring element.
- the helix angle of the sun gear 17 of the planetary transmission 13 is preferably opposite to the helix angle of the pinion 20 of the spur gear transmission 14 .
- the directions of the helix angle of the sun gear 17 of the planetary transmission 13 and the pinion 20 of the spur gear transmission 14 preferably need to be selected in a way such that the load at the bearings of the drive device 11 are minimized.
- friction losses are minimized and smaller dimensions of the bearings are made possible.
- the amount and the sign of the helix angle of the spur gear 16 can be selected in an advantageous way so that the loads of a conventional wheel bearing can be accommodated.
- the bearing of the output 25 of the drive device 11 meaning a shaft 25 which is connected with the spur gear 21 , forms the wheel bearing of the wheel 7 , which can be designed as a bearing in a conventional construction, for instance having a two-row roller bearing, or as a bearing which comprises two single helix roller bearings with a contact angle of between 15° and 60°. Therefore, the number of bearings of the drive device can be reduced in an advantageous way.
- a housing of the drive device 11 particularly in the case of the design according to FIG. 2 , the housing 26 of the electric machine 12 is directly connected to the trailing arm 2 of the torsion rod axle 1 , preferably by screws.
- the housing 26 of the electric machine 12 can also be integrated into the trailing arm 2 as a multi-part welded component, or can be designed as one part with the trailing arm 2 .
- the electric machine 12 can be inserted like a cartridge into the trailing arm 2 which serves in this case as a common housing.
- connection of the brake caliper in the case of a disc brake and/or the damper 9 and/or the spring 10 are integrated into a housing of the drive device 11 , in particular in the case of a design in accordance with FIG. 2 , into the housing 26 of the electric machine 12 , whereby the connecting screws for fixing the brake caliper can be at the same time the housing screws used for attaching the drive device 11 to the trailing arm 2 of the axle.
- FIG. 3 shows as an example the integration of the connection of the damper 9 and the spring 10 with the housing 26 of the electric machine 12 , as well as the direct connection of the housing 26 of the electric machine 12 with the trailing arm 2 .
- the electric machine 12 can be designed as a hollow shaft motor, meaning that the inner rotor can be designed as a hollow shaft rotor 15 , whereby the planetary transmission 13 is positioned at the side of the electric machine 12 which is facing a way from the wheel 7 , that the spur gear transmission 14 is positioned on the side of the electric machine 12 facing the wheel 7 , and that the carrier shaft 19 of the planetary transmission 13 is passes through the cavity of the rotor 15 of the electric machine 12 to the pinion 20 of the spur gear transmission 14 .
- the housing 24 of the planetary transmission 13 can for instance be directly connected with the trailing arm 2 of the torsion rod axle 1 .
- the advantage is achieved that in the area of the chassis longitudinal beam the construction space is provided which can be used during deflections, because the housing 24 of the planetary transmission 13 can be designed with a smaller outer diameter than the housing 26 of the electric machine 12 .
- the electric machine 12 of the drive device 11 can be designed as an asynchronous machine, as an externally or permanent magnet excited synchronous machine or as a transverse field machine, which offers a large flexibility.
- the presented drive device can also be combined with any axle types, for instance with a central control arm axle, control arm, trailing arm, suspension arm, or trapezoidal arm axles.
- the drive device has a low number of bearings and offers sufficient access, whereby it can be integrated with an existing axle with just little modification. For instance, in the case of a torsion rod axle, just the trailing arm needs to be replaced with a modified part.
- the braking device for the wheels can be designed as disc brake or drum brake;
- the drive device can be designed as air cooled or fluid cooled, whereby the electric machine, the planetary transmission and the power electronics can have a common cooling.
- the power electronics can also be fixed to the wheel or to the engine.
- the spring 10 is mounted at the longitudinal beam of the chassis 27 .
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
- Braking Arrangements (AREA)
- Fluid-Damping Devices (AREA)
- Arrangement Of Transmissions (AREA)
- Motor Power Transmission Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
- This application is a National Stage completion of PCT/EP2012/051640 filed Feb. 1, 2012, which claims priority from German patent application serial no. 10 2011 005 616.5 filed Mar. 16, 2011.
- The present invention concerns a drive device to drive a wheel of an electrically powered vehicle.
- Generally, the drive train configuration in an electrically driven vehicle is the same configuration as in vehicles which have a central drive, comprising a combustion engine. Hereby, a drive device which comprises of an electric machine, a transmission, and a differential which is fixed to the chassis in a position in the center of the vehicle between the front wheels and the rear wheels; the drive torque is transferred like in conventional central drives via side shafts to the driven wheels. In such a configuration of the drive train, the chassis concept is mostly maintained, wherein only modifications in the aggregate bearings and auxiliary frames are required.
- In an electrically driven or rather drivable vehicle which comprises a central drive, accommodating the battery represents a significant construction modification. It is known hereby that the battery needs to be integrated, for instance under the back seat or in an area which is usually occupied by the transmission duct in central drives having a combustion engine.
- Also, electric drives that are arranged near the wheels are known in the state-of-the-art, wherein near the wheel means a drive in the broader sense which has one or several electric motors for each driven wheel of a vehicle. Therefore, vehicles are known which have two or more driven wheels which have a corresponding number of drives, meaning two or more. Hereby each electric motor can precisely drive one drive wheel.
- In addition, known in the state of the art are electric drives arranged close to the wheel so as to drive a driven wheel for electrically driven vehicles which are integrated into the chassis of the vehicle whereby, depending on the number of driven wheels of the vehicle, either two or four electric drives are provided.
- Wherein, the electric drives can be positioned fixed to the wheel carrier; in this case, the electric drive swings directly with the respective wheel and the unsuspended mass is directly influenced by the drive.
- Another possibility for positioning, the electric drives which are close to the wheel can be fixed in position. Hereby, the electric drives are moved from the center of the vehicle towards the wheels. The drives are, however, still attached to the chassis structure and therefore do not influence the unsuspended masses.
- The electric drives can also be positioned at suspension rods, whereby they are attached in this case at the chassis suspension rods, for instance at the torsion rods. In this concept, the unsuspended mass is reduced by positioning the electric drives close to the chassis-fixed connection points of the suspension rod.
- Known through the
DE 10 2007 039 059 A1 by the applicant is a driven vehicle axle, designed as a torsion rod axle, in which each wheel of the axle has an electric motor assigned to it which is positioned with the rotational axis in the longitudinal direction of the vehicle, whereby its housing represents a part of the longitudinal swing part of the torsion rod. - The drives which are close to the wheel can be utilized in vehicles with an all-wheel, front, or rear drive, whereby the type of axles of the driven vehicle axles can be conventional axel types, such as for instance strut axles or double wishbone axles. In addition the drives close to the wheel can be integrated with the wheel integrated chassis.
- Also, the electric drives which are close to the wheel can have a transmission.
- Known through WO 2008/017945 A1 is a drive device, which can be integrated into a wheel of a vehicle, to drive the wheel where the device comprises of an electric motor and a transmission device, wherein the transmission device comprises a spur gear transmission and a planetary transmission which are connected in series. Hereby, the planetary transmission is positioned, viewed in the flow of force direction in traction operation, at the output side of the spur gear transmission.
- The use of electric drives close to the wheel for driving a wheel of a driven axle results, in an advantageous manner, in a vehicle configuration with a high flexibility, because of the elimination of the central drive in the center of the vehicle creates, and new degrees of freedom in the vehicle design, in particular during the design of the interior of the vehicle, the battery accommodation, and the crash safety.
- In addition, drives torques can be generated at individual wheels through electric drives near the wheel, whereby functions such as torque vectoring, ESP, ABS, ASR, etc. can be realized in a simple way. Through the fast and accurate control of electric drives, these functions can be optimized in comparison to the traditional, brake based control systems.
- The objective of the present invention is to present a drive device for the drive of a wheel for an electrically driven vehicle.
- Thus, a drive device for the drive of a wheel of a torsion rod axle for an electrically driven vehicle is proposed, comprising an electric machine and a transmission unit, whereby the transmission unit has a spur gear transmission and a planetary transmission which is positioned, when viewed in the flow of force direction in a traction-mode, on the output side of the electric machine in the sequence of the planetary gear-spur gear transmission.
- The planetary transmission is positioned coaxial to the rotor of the electric machine, wherein the spur gear transmission is positioned axially parallel to the rotor of the electric machine. The drive device is positioned axially parallel to the wheel axis.
- In this concept, the axial offset is used to reduce the distance between the center of gravity of the drive device and the point of rotation, around which the wheel axis moves, relative to the vehicle construction, which again results in a reduction of the unsuspended mass. Preferably, the drive device is positioned between the center of the wheel and the point of rotation, within the point of rotation, or in the center of the wheel which is facing away from the point of rotation.
- Through the combination of the planetary transmission with a spur gear transmission, a large gear ratio is made possible while the dimensions, as well as the weight of the electric machine and therefore the unsuspended mass, can be kept low; for instance, the achieved gear ratio can be a value larger than 10, due to the two transmissions. Preferably, the gear ratio, meaning the ratio between the rotational speed the driveshaft of the transmission in comparison to the rotational speed of the output shaft of the transmission, has a value larger than 10, preferably between 13 and 18, in particular the
value 16. Hereby, the distribution of the achievable gear ratios to the transmissions can be performed symmetrically or asymmetrically. - The combination of a low drive torque with the use of high rotational ratios, as a sum and in connection with the two transmission of the drive device, results in an advantageous manner in a large power performance/weight ratio (kW/kg). The electric machine can therefore have small dimensions, which advantageously enables or rather simplifies, the integration of the electric machine into the trailing arm.
- Also, the use of a spur gear enables an offset between the driveshaft of the electric machine and the wheel axle, so that the electric machine can be moved on the trailing arm further in the direction of the connection point of the trailing arm, therefore lowering the unsuspended mass.
- By positioning of the spur gear, which is reduced in size, in the direction of force after the planetary transmission, it becomes possible to maintain the position of the spring and the damper in the proximity of the wheel center and to enable a favorable reaction and tuning behavior.
- By using the transmissions with a high rotational speed electric motor, like a machine with a maximal rotational speed of more than 15,000 rpm, preferably between 18,000 and 22,000 rpm, in particular 21,000 rpm, this enables positioning the planetary transmission immediately following the electric machine with lesser sound than when using a spur gear in the same position, because the planetary transmission is generally designed more compact and the housing surfaces, which transmit sound, in the area of the high-speed transmission section are reduced.
- A housing of the drive device can serve as a wheel carrier, as a wheel mounted suspension rod, or as part of the wheel carrier and pass created forces into the chassis.
- Preferably the electric machine and the transmission unit are positioned in such a way that, in a primary position of operation of the vehicle, the lubrication material flows back due to gravity into the oil sump in the transmission space, whereby for this purpose the housing of the electric machine is designed in a way that sufficient lubrication of the bearings of the rotor shaft is guaranteed. This creates the advantage that the necessity of providing connecting or non-connecting gaskets, in particular for fast rotating shafts of the drive device can be omitted, and the losses of lubricant and the creation of heat is reduced.
- Within the framework of a further embodiment of the invention, it is proposed to connect the housing of the drive device directly to the trailing arm of the torsion rod axle, for instance to screw it together, to integrate it as a multi-part welded component with the trailing arm, or to design it as one part with the trailing arm.
- Within the framework of a further embodiment, the electric machine and the planetary transmission can have a common housing.
- Also, the connection of the brake caliper, in the case of a disc brake and/or the damper and/or the spring, can be integrated in the housing of the drive device, whereby the connecting screws for attaching the brake caliper are at the same time the screws for the housing and for the attachment of the drive device at the trailing arm of the axle.
- Through this, a compact construction is achieved and there is no need for separate components which results in a reduction of the cost.
- The drive device can in particular be combined with a torsion rod, a central control arm axle, a suspension arm axle, or a trailing arm axle. Hereby, a torsion rod axle is for instance meant as an axle with two trailing arms and a crossmember which connects them. A central control arm axle is meant to be an axle with two trailing arms, whereby each trailing arm is connected with two crossmembers, which are mounted to the chassis. A suspension arm axle has at each wheel an approximately triangular swing arm which is connected with the two ends at the chassis and with the apex at the wheel carrier. A trailing arm axle is an axle which has at each wheel a trailing arm which is on one side connected with the chassis and on the other side with the wheel.
- The invention is further explained in the following based on the attached drawings, whereby for the same parts, the same reference characters are used. These show:
-
FIG. 1 a schematic top view of a designed torsion rod rear axle as in the state-of-the-art; -
FIG. 2 a schematic sectional view of a first embodiment of an inventive drive device for an electrically driven vehicle and the positioning of the drive device; and -
FIG. 3 a perspective view of the configuration of an inventive drive device. - In reference to
FIG. 1 , a reartorsion rod axle 1, as in the state-of-the-art, comprises of twotrailing arms cross-section 4. - The rear
torsion rod axle 1 is screwed together through tworubber bearings 5, 6 with the chassis of the vehicle. The wheels of the reartorsion rod axle 1 are marked in the drawing with thereference characters FIG. 1 shows adamper 9 and aspring 10 of theaxle 1. - The embodiment shown in
FIG. 2 of the invention presents adrive device 11 for driving awheel 7 of atorsion rod axle 1 of an electrically driven vehicle which has anelectric machine 12 and a transmission unit which comprises of aspur gear transmission 14 and aplanetary transmission 13 which, when viewed in the direction of the power flow during traction operation, are positioned towards the output, after theelectric machine 12 in the sequence of theplanetary transmission 13—thespur gear transmission 14. Theplanetary transmission 13 and thespur gear transmission 14 are in this example, axially viewed, positioned on the side of theelectric machine 12 facing thewheel 7. - In the shown example, the
rotor 15 of theelectric machine 12, which is designed as an inner rotor, is connected via a sun gear shaft with the sun gear 17 of theplanetary transmission 13, whereby the carrier 18 of theplanetary transmission 13 is connected, via a carrier shaft 19, to the pinion 20 (meaning with the small gear) of the spur gear transmission, which meshes with the spur gear 21 (meaning with the large gear). Thespur gear 21 is connected with thewheel hub 22 of thewheel 7, preferably by means of a pluggable spline shaft connection or a polygon profile, or designed as one part with thewheel hub 22, whereby the installation and manufacturing costs are reduced. The connection between the carrier shaft 19 and thepinion 20 is preferably axially and radially supported through roller bearings, slide bearings, or thrust washers. The stator of the electric machine inFIG. 2 is marked with thereference character 16. - In addition, the ring gear 23 of the
planetary transmission 13 is fixed in positioned to the housing; it can be coupled to thehousing 24 of theplanetary transmission 13, designed as one part with thehousing 24, or press-fit into thehousing 24. In the case that the ring gear 23 is designed as one part with thehousing 24, a radial recess can be provided to compensate for the difference in the diameters between thehousing 24 and the ring gear 23. If the ring gear 23 is designed as a ring gear ring which can be press-fit into a cylindrical housing, the material can be selected depending on the load, which might result in a reduction of the weight. - The
planetary transmission 13 and theelectric machine 12 can have a common housing within the framework of a further embodiment. In the example which is shown inFIG. 2 , the housing of theelectric machine 12 is marked with thereference character 26. - In addition, the
rotor shaft 15 of theelectric machine 12 can be designed as one part with the sun gear shaft; the carrier shaft 19 can also be designed as one part with thepinion 20. - Within the framework of additional, not here presented embodiments, the drive and/or the output of the
planetary transmission 13 can take place via an additional element of the planetary transmission. - The gearing is preferably of a helical design, whereby the bearing of the sun gear shaft of the
planetary transmission 13 is formed through the bearing on the drive side of therotor 15 of theelectric machine 12, so that the need for separate bearings can be omitted, whereby the bearing of therotor 15 of theelectric machine 12, facing away from the sun gear 17 of theplanetary transmission 13, can be preferably axially pre-loaded through a spring element. - Hereby, the helix angle of the sun gear 17 of the
planetary transmission 13 is preferably opposite to the helix angle of thepinion 20 of thespur gear transmission 14. In addition, the directions of the helix angle of the sun gear 17 of theplanetary transmission 13 and thepinion 20 of thespur gear transmission 14 preferably need to be selected in a way such that the load at the bearings of thedrive device 11 are minimized. Thus, friction losses are minimized and smaller dimensions of the bearings are made possible. The amount and the sign of the helix angle of thespur gear 16 can be selected in an advantageous way so that the loads of a conventional wheel bearing can be accommodated. - Also, the bearing of the
output 25 of thedrive device 11, meaning ashaft 25 which is connected with thespur gear 21, forms the wheel bearing of thewheel 7, which can be designed as a bearing in a conventional construction, for instance having a two-row roller bearing, or as a bearing which comprises two single helix roller bearings with a contact angle of between 15° and 60°. Therefore, the number of bearings of the drive device can be reduced in an advantageous way. - In accordance with the invention, a housing of the
drive device 11, particularly in the case of the design according toFIG. 2 , thehousing 26 of theelectric machine 12 is directly connected to the trailingarm 2 of thetorsion rod axle 1, preferably by screws. As an alternative, thehousing 26 of theelectric machine 12 can also be integrated into the trailingarm 2 as a multi-part welded component, or can be designed as one part with the trailingarm 2. In addition, theelectric machine 12 can be inserted like a cartridge into the trailingarm 2 which serves in this case as a common housing. - In the framework of a further embodiment of the invention, the connection of the brake caliper in the case of a disc brake and/or the
damper 9 and/or thespring 10 are integrated into a housing of thedrive device 11, in particular in the case of a design in accordance withFIG. 2 , into thehousing 26 of theelectric machine 12, whereby the connecting screws for fixing the brake caliper can be at the same time the housing screws used for attaching thedrive device 11 to the trailingarm 2 of the axle. - Hereby, a compact construction is achieved and the need for additional parts can be omitted, which results in a reduction of the cost.
-
FIG. 3 shows as an example the integration of the connection of thedamper 9 and thespring 10 with thehousing 26 of theelectric machine 12, as well as the direct connection of thehousing 26 of theelectric machine 12 with the trailingarm 2. - Within the framework of an embodiment of the invention which is not shown here, the
electric machine 12 can be designed as a hollow shaft motor, meaning that the inner rotor can be designed as ahollow shaft rotor 15, whereby theplanetary transmission 13 is positioned at the side of theelectric machine 12 which is facing a way from thewheel 7, that thespur gear transmission 14 is positioned on the side of theelectric machine 12 facing thewheel 7, and that the carrier shaft 19 of theplanetary transmission 13 is passes through the cavity of therotor 15 of theelectric machine 12 to thepinion 20 of thespur gear transmission 14. In such a design, thehousing 24 of theplanetary transmission 13 can for instance be directly connected with the trailingarm 2 of thetorsion rod axle 1. - By swapping the positions of the
electric machine 12 and theplanetary transmission 13, in comparison to the embodiment example inFIG. 2 , the advantage is achieved that in the area of the chassis longitudinal beam the construction space is provided which can be used during deflections, because thehousing 24 of theplanetary transmission 13 can be designed with a smaller outer diameter than thehousing 26 of theelectric machine 12. - The
electric machine 12 of thedrive device 11 can be designed as an asynchronous machine, as an externally or permanent magnet excited synchronous machine or as a transverse field machine, which offers a large flexibility. - Through the inventive concept, a very compact construction of the drive device can be realized, with a low unsuspended mass and a large power/weight ratio (kW/kg).
- The presented drive device can also be combined with any axle types, for instance with a central control arm axle, control arm, trailing arm, suspension arm, or trapezoidal arm axles.
- In addition, the drive device has a low number of bearings and offers sufficient access, whereby it can be integrated with an existing axle with just little modification. For instance, in the case of a torsion rod axle, just the trailing arm needs to be replaced with a modified part.
- Also, the braking device for the wheels can be designed as disc brake or drum brake; the drive device can be designed as air cooled or fluid cooled, whereby the electric machine, the planetary transmission and the power electronics can have a common cooling. The power electronics can also be fixed to the wheel or to the engine.
- Furthermore, the
spring 10 is mounted at the longitudinal beam of thechassis 27. -
- 1 Torsion Beam—Rear Axle
- 2 Trailing Arm
- 3 Trailing Arm
- 4 Cross-Section
- 5 Rubber Bearing
- 6 Rubber Bearing
- 7 Wheel
- 8 Wheel
- 9 Damper
- 10 Spring
- 11 Drive Device
- 12 Electric Machine
- 13 Planetary Transmission
- 14 Spur Gear Transmission
- 15 Rotor
- 16 Stator
- 17 Sun Gear of the
Planetary Transmission 13 - 18 Carrier of the
Planetary Transmission 13 - 19 Carrier Shaft
- 20 Pinion
- 21 Spur Gear
- 22 Wheel Hub
- 23 Ring Gear 23 of the
Planetary Transmission 13 - 24
Housing 24 of thePlanetary Transmission 13 - 25 Output of the
Drive Device 11 - 26 Housing of the
Electric Machine 12 - 27 Longitudinal Beam
Claims (15)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011005616A DE102011005616A1 (en) | 2011-03-16 | 2011-03-16 | Drive device for driving a wheel for an electrically driven vehicle |
DE102011005616.5 | 2011-03-16 | ||
DE102011005616 | 2011-03-16 | ||
PCT/EP2012/051640 WO2012123175A1 (en) | 2011-03-16 | 2012-02-01 | Drive device for driving a wheel for an electrically powered vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
US20140000970A1 true US20140000970A1 (en) | 2014-01-02 |
US9132723B2 US9132723B2 (en) | 2015-09-15 |
Family
ID=45562319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/004,739 Expired - Fee Related US9132723B2 (en) | 2011-03-16 | 2012-02-01 | Drive device for driving a wheel for an electrically powered vehicle |
Country Status (6)
Country | Link |
---|---|
US (1) | US9132723B2 (en) |
EP (1) | EP2686188B1 (en) |
JP (1) | JP5945287B2 (en) |
CN (1) | CN103459181B (en) |
DE (1) | DE102011005616A1 (en) |
WO (1) | WO2012123175A1 (en) |
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US20180050398A1 (en) * | 2015-03-31 | 2018-02-22 | Hitachi Koki Co., Ltd. | Power Tool |
US10131218B2 (en) * | 2016-08-24 | 2018-11-20 | Polymagnet Nw Llc | In-wheel motor for a vehicle and a vehicle comprising the motor |
WO2020178751A1 (en) * | 2019-03-05 | 2020-09-10 | Qooder S.A. | A system and method for controlling a vehicle's attitude, and a vehicle equipped with said system |
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US11292332B2 (en) * | 2017-07-12 | 2022-04-05 | Allison Transmission, Inc. | Axle assembly for low floor vehicle |
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US9266557B2 (en) * | 2011-11-16 | 2016-02-23 | Nissan Motor Co., Ltd. | Steering device for wheel |
US20140353054A1 (en) * | 2011-11-16 | 2014-12-04 | Nissan Motor Co., Ltd. | Steering device for wheel |
US20150191070A1 (en) * | 2012-07-03 | 2015-07-09 | Pantero Technologies Inc. | Semi-independent suspension system for a low-floor vehicle |
US9527368B2 (en) * | 2012-07-03 | 2016-12-27 | Pantero Technologies Inc. | Semi-independent suspension system for a low-floor vechicle |
US20180050398A1 (en) * | 2015-03-31 | 2018-02-22 | Hitachi Koki Co., Ltd. | Power Tool |
US10702932B2 (en) * | 2015-03-31 | 2020-07-07 | Koki Holdings Co., Ltd. | Power tool having first elastic member and second elastic member accommodated in first gear |
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US20210245599A1 (en) * | 2018-05-10 | 2021-08-12 | Allison Transmission, Inc. | Axle assembly for low floor vehicle |
US11505061B2 (en) * | 2018-05-10 | 2022-11-22 | Allison Transmission, Inc. | Axle assembly for low floor vehicle |
US20230081161A1 (en) * | 2018-05-10 | 2023-03-16 | Allison Transmission, Inc. | Axle assembly for low floor vehicle |
US11697340B1 (en) * | 2018-11-30 | 2023-07-11 | Robert P Thomas | Electric portal wheel hub system |
WO2020178751A1 (en) * | 2019-03-05 | 2020-09-10 | Qooder S.A. | A system and method for controlling a vehicle's attitude, and a vehicle equipped with said system |
Also Published As
Publication number | Publication date |
---|---|
CN103459181B (en) | 2016-06-08 |
JP5945287B2 (en) | 2016-07-05 |
US9132723B2 (en) | 2015-09-15 |
EP2686188A1 (en) | 2014-01-22 |
WO2012123175A1 (en) | 2012-09-20 |
EP2686188B1 (en) | 2016-07-13 |
CN103459181A (en) | 2013-12-18 |
JP2014514197A (en) | 2014-06-19 |
DE102011005616A1 (en) | 2012-09-20 |
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